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The diameter of a circle is the length of a straight line from a point on the edge of the circle passing through the center of the circle and onto a point on the opposite edge of the circle.

The radius of a circle is the length of a straight line from the center of a circle to a point on the edge of the edge of the circle.

So the radius of a circle is half its diameter, in this case 8cm.

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10y ago

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